removed crazy stuff in meshGFace.cpp

Some steps to a better usability with compounds. Improvements in drawing of compounds: Edges of compounded surfaces in the CAD are hidden, only the collection of compounded surfaces is shown, the single surfaces are hidden. The draw command is called for the compound and then piped to the underlying surfaces. Can be controled with commandline parameter 'compound_only'. Further steps will follow in near future (high order meshes using compounds etc.).

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in meshing some 2D periodic surfaces. 

     boundary layers in 2D 
     periodi bug fixed
     many other stuff

JF    

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+ fix misc compile errors with MSVC (thanks to Michel)

Caveats:

- We don't support new MED3 features (evolving meshes, multi-profile per field step (?))
- I still get crashes on files that used to work with MED2. However the mdump code
  shipped with MED3 also crashes on these files, so the bug might not be with Gmsh...

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bubble benchmark for level set !